20002121121 has 8 divisors (see below), whose sum is σ = 26670198240. Its totient is φ = 13334395712.

The previous prime is 20002121071. The next prime is 20002121129. The reversal of 20002121121 is 12112120002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20002121121 - 2¹⁸ = 20001858977 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20002121097 and 20002121106.

It is not an unprimeable number, because it can be changed into a prime (20002121129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105670 + ... + 226208.

It is an arithmetic number, because the mean of its divisors is an integer number (3333774780).

Almost surely, 2^20002121121 is an apocalyptic number.

It is an amenable number.

20002121121 is a deficient number, since it is larger than the sum of its proper divisors (6668077119).

20002121121 is a wasteful number, since it uses less digits than its factorization.

20002121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175855.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20002121121 its reverse (12112120002), we get a palindrome (32114241123).

It can be divided in two parts, 20002 and 121121, that multiplied together give a palindrome (2422662242).

The spelling of 20002121121 in words is "twenty billion, two million, one hundred twenty-one thousand, one hundred twenty-one".